Allowance for the emergency opening of locks (Impression technique (indentation))
Technique indentation - possession of this method of hacking can talk about the professionalism of the cracker. Long and painstaking work associated with the gradual grinding of a file with extra areas of metal key, part of which is responsible for secrets, this happens until the key becomes a copy of the native.
The undoubted advantages include the fact that you have a fully working duplicate, with which you can easily open the lock next time. Master keys do not give such effect.
This text is a translation of the English version of the manual published online. (translation author Alexey Goncharenko, firstname.lastname@example.org).
The knowledge and application of the indentation method is invaluable for emergency door opening services. In contrast to the disassembly / cracking method, this push-in method provides not only the opening of the lock, but also the manufacture of the corresponding key. This means that the indentation method (key selection) is not only effective, but also very economical. These working materials on indentation technology are divided into three main groups:
- Locks with disc restraints (levers)
- Locks with pin restraints
- Locks with cylinder and cross bolt
All this forms the basis of a theory on a technology called IMPRESSION TECHNOLOGY (Indentation Technique).
Table of contents
- Basics of indentation technique
- Markings / prints
- Preparation of key blanks
- Rotation and pressure
- Types of keys
- Locks with cylinder - transverse bolt
- Concluding remarks
1 Basics of indentation technique
The theoretical side of technology.
First, the key blank is prepared for operation.
- Surface file processing
- File file processing
- File Edging
- And - processing by a file of one edging (angle 45 °)
- B - double-edged file processing (with opposite angles of 45 °)
- C - Blackening / coloring
Each of these methods is described in detail in the chapter on making blanks for a key.
1. The key for the key, made for pressing in, is inserted into the channel of the lock cylinder. You must ensure that the disc is inserted into the cylinder as far as possible. It should not make too much effort.
2. Firmly hold the key with special tongs. Then it should be very firmly clamp the head of the key inserted into the cylinder with tongs. For this, it is best to use special tongs. These forceps have soft sponges, so scratches cannot form on the disc. It should be followed then that the jaws of the tongs are parallel to each other, since only in this case the greatest effort is provided to hold the key blank.
3. Now turn the key inserted into the cylinder to the right until it stops. At the same time, it is necessary to pay attention to the fact that too much force is not applied, since it is possible to break or bend the disc.
4. In conclusion, the block clamped with tongs should be pressed up or down several times. Because only thanks to such movements noticeable prints appear on the blank.
5. During the subsequent working cycle, turn the key inserted into the cylinder to the left until it stops. At the same time, you should also pay attention to the fact that too much force is not applied, since you can break or bend the disc.
6. Now you can remove the disc from the cylinder.
Your blank should, during all work processes, that is, from preparing the blank to the subsequent manufacture of a key, remain clamped in the tongs. Only in this way it is possible to provide a feeling of consistency of unity in the combination “blanks and tongs” and to avoid mistakes due to uneven clamping of the blanks.
The result of the manipulations will lead to the fact that the cylinder pins left obvious traces of markings or imprints on the blank.
Now the question is, why prints appear?
When inserting the blank, the cylinder pins are squeezed to a different height. If the pig is turned all the way, then one should proceed from the assumption that no cylinder is manufactured without manufacturing tolerances or cannot be manufactured. One of these tolerances is the drilling tolerance; that is, the drills for the pins with their centers are not strictly on one line, but are slightly offset from the centerline. From this it follows that the pins are blocked at different times. As a result, markings or prints appear, either while rotating to the right or to the left against the stop.
When turning the blanks in the cylinder to the stop, the internal pins that are in the zone of the separation gap are blocked in their position.
The contact between the pins of the core and the housing is created when the blanks move up and down. Markings and prints occur when moving up and down, and not due to the rotation of the blanks, as is often assumed.
In places where markings and fingerprints are visible, further file processing is performed.
The above-mentioned processes for obtaining markings and prints are repeated until the cutouts formed at the appropriate places at the appropriate places reach the corresponding depth at which the core pins can be moved out of the separation gap. In this case, the force of contact between the pins of the case and the core will not be sufficient to leave clear markings or imprints on the key.
The main rule of the impression technique is: No file processing in areas where you can not see clear markings or prints!
When performing file processing, you should always remove only a little material, that is, jumps not more than 0.5 mm. Naturally, in this case, the production of the key is a little slower, however, working carefully, you can avoid having to start work all over again if too much material is suddenly removed.
Markings / prints
Markings and prints on the key blank arise because the key blank made of metal is pressed against the holding devices in the cylinder (pins / discs), which are also made of metal.
Every time when metals come into contact with each other or rub and scratch their surfaces, there is a marking or imprint.
For the impression technique, this means that these markings or prints must be clearly recognizable in order to process the file in the right place. At the beginning of the impression process, markings are difficult to determine, but at the end of the process they become larger, easier to identify and process.
Attention: If already at the beginning of the impression process at a certain section or at a completely defined depth, too large markings are obtained, then in most cases this indicates that the following factor occurs:
- In this section, it is really about the depth No. 1. In this case, the impression process for this pin in the cylinder is completed.
- When preparing the key blank, too much material was removed. This is a big defect for the impression technique, since even before the work begins, the conditions for its termination are created.
Thus, an improperly prepared blank will each time be labeled at the appropriate place while there is nothing to grind on it. This phenomenon is explained by the fact that the housing pin is already in the zone of the separation gap. If the movement is left or right, it is not the core pin that is blocked, but the body pin. Therefore, with each subsequent workflow, new markings or prints are made.
It is important to understand that the markings created by the impression technology can be very different from each other.
These differences depend on the following two factors:
- on the type of lock used with the cylinder, i.e. pin or disc restraints (levers), etc.
- from the point at which markings are created during the workflow, i.e. at the beginning, in the middle or at the end.
The type of marking is determined by the design of the holding devices of the lock to be opened. In principle, two different forms of marking are distinguished:
- line markings produced by lock discs with disc restraints (levers).
- dot marking produced by lock pins with pin restraints.
The closer you approach the end result of the closures (cuts), the more distinct the markings become.
The size and depth of individual markings vary from the very beginning to the end of the impression process.
The closer you approach the corresponding depth of the corresponding closures (cuts), the more distinct the markings become, as long as they should be considered as final or final markings.
After processing the blank with a file, the covering surface should be mirror-smooth. Only in this case will it be possible to distinguish the initially weak markings.
File file processing
When processing with a file, the closing surface of the blank is prepared only in those places where, according to the measurement, there must be short circuits on the cylinder. Also these areas should be mirror smooth.
File file processing after measuring distances
Preparation of key blanks
There are four effective methods for preparing blanks:
- Surface file processing
- File file processing
- File Edging
- Blackening or staining of contact planes
Surface file processing
With this method, the file is easily processed by the file of the locking plane of the blank, so that there is neither chrome nor paint on it, so that after the first impression process (fingerprinting) it is possible to clearly distinguish the markings and determine the distance between the individual closures.
Then further impression processes are carried out, as already described earlier.
Note: When processing a blank with a file, remove less material than is required for the circuit itself.
If you remove too much material, the consequence may be that the markings will not be accurate and the workflow will become impossible.
For filing edgings there are two ways below:
- Two-sided file processing of the locking surface of the blanks at an angle of 45% each time, and you get a piping that looks like a knife blade. This means that from the flat surface of the blanks, it is necessary to remove evenly under the corners of the chamfer.
- One-sided file processing of the locking surface of the blank at an angle of 45%. This means chamfering from the side face of the blank.
During both preparation options, care should be taken not to remove too much material from the file.
In case of locking cylinders with pins in the body, it is also important that the edge of the billet pass under the center of the axis of the cylinder pins. Many services working with keys readily use these two options, as the sharp edge allows to accurately determine the distance between short circuits and, moreover, markings in more difficult cases with locks with restraints (levers) and a cross bar.
You should try both options and choose a working option that provides you with the best result.
Blackening and staining of the contact surface of the blank
When blacking or staining the contact surface of the blank, this is a method in which the markings become visible in the opposite way. This means that after pre-blackening or coloring, the blanks do not receive a dark marking on a light background, but instead a light marking on a dark background.
In this case, there are also several training options.
1. Blackening with soot
With this workflow, the corresponding blank is held above the lit lighter and directly above the flame. At the same time the pig is covered with soot and turns black. Marking occurs due to the fact that the disks or cylinder pins remove a layer of soot, and in these places you can then see the pure metal of the pig, which is the marked point.
Here, too, the corresponding blank is covered with a dye in the first operating cycle. As a rule, this is a paint from a felt-tip pen with a felt rod or a marking varnish when processing metal products. Marking occurs as described when soot is used.
3. Ultraviolet kit
As with blackening with soot and dyeing, the blanks are covered with coloring fluid during the first working cycle, but in this case we are talking about a fluorescent liquid.
After taking the markings or prints, keep the blank under the UV lamp. This special light provides clear visibility of markings and prints, since the corresponding places become visible much darker than the other locking area, which glows under an ultraviolet lamp.
The methods described above are certainly not the only methods for preprocessing and preparing key blanks. They are only the most common and effective methods, and everyone can decide for himself what he would prefer. It is best if the user tries each method in different conditions and under different light conditions.
The key blank is prepared for work using the method of impression technique, namely:
- Surface file processing
- File file processing
- File Edging
- Blackening / staining
The key of the key is inserted, possibly deeper into the cylinder shut-off channel.
Turn the key blank with a moderate effort to the right. Press up and down
Key blank several times strongly push up and down. Then, with moderate pressure, turn the blank all the way to the left. After that, the blank several more times strongly push up and down.
Remove the key blank from the cylinder, and check the markings. At the location of the markings, the material is removed by a file, but only where the markings are. Places without markings should not be processed, even if the distances between closures are fixed.
The above stages of work 1 - 5 should be repeated as long as the locking key is not received.
Training, practical application and experience make the user from this method a specialist. Practice is especially important in order to be able to distinguish the necessary markings from insignificant ones.
For most users, it is the application of this technology that is on the verge of their visual abilities.
However, poor eyesight is not an obstacle, as it can be compensated for by modern grinding of magnifying glasses or working loops, which, depending on the version, can be illuminated or unlit.
It should again be recalled that the rotational movement to the stop should be performed with moderate effort, if only because with great effort it is impossible to obtain recognizable markings. There is only the danger that the key blank will be broken or bent.
Special care is required if there are disc restraints and cylinders with a transverse bolt. With these systems, with too much force, the cylinder may be damaged during rotation, since the washers or pins will be bent.
On the other hand, a little effort is not enough to block the pins. As a result, markings either do not appear at all or do not appear very vague prints.
In order to successfully use the impression technology, the user must be trained for a long time in obtaining the correct rotational force.
Here are the books that allow you to get even more valuable knowledge in the castles. Lock letters.
SA McLean, "The Impression System of Key Fitting", Dire Locksmith
Supply Co., 2201 Broadway, Denver, Colorado 808205, 1946 "Locksmithing and Keymaking Course Manual", Locksmithing Institute, Little Falls, New Jersey, 1968
"Padlock Handbook", Locksmith Ledger, 2720 Des Plaines Ave., DesPlaines, Ill., 60018, 1970
"How To Do Locksmiths", Locksmith Ledger, 1800 Oakton St., DesPlaines, Ill., 60018, 1971
"Know How for Locksmiths", Locksmith Ledger, 1970
"The Lock Pick Design Manual", Paladin Press, PO Box 1307, Boulder, Colorado 80302, circa 1975
TC Mickley, "Lock Servicing, Volume 4", Locksmith Ledger, 850 Busse Highway, Park Ridge, IL 60068, 1980
Eddie the Wire, "How to Make Your Own Professional Lock Tools, Volume 2", Loompanics Unlimited, PO Box 1197, Port Townsend, WA 98368, 1981
Hank Spicer, "Impressioning with Hankman", RSG Publishing Corp., Dallas, Texas, 1995
The remaining parts do not make sense to publish, as it is already intended for professionals.
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